Title says it all: how did you satisfy your cravings before you bought your first pack(sounds like a cigarette thread, huh)? How did you carry them out?
I did it in several ways:
First, I took them from my sister, because she was a bedwetter and was the same size as me. When she grew out of them, I'd take them from wherever I could find them. My granddad stayed with us during the last few years of his life, and he had dementia and had to wear diapers. I was pretty excited to take one for the first time; they were stored on the washing machine right across from my room. My aunt's house had some in the bathroom I'd lift whenever I went there, until they stopped putting diapers in there. I'd also get them from people who'd visit and bring their kid along. A friend of the family had grandsons who were still in diapers at age 4, and I got some of theirs. I then started to take them from my sister who owns a daycare service. She had and still has nearly every brand in every size available.
Since I was too big to fit in the baby diapers, I'd just stuff them inside my underwear when I took them. I always made sure to wear baggy pants. Whenever I could I'd take a bag, box, etc along with me to smuggle them with.